A vivaldi antenna

Abstract

The invention discloses a Vivaldi antenna; a PCB board top layer comprises an input port feed line, a terminal open circuit half-wavelength resonator and a terminal short circuit step impedance resonator; a PCB board bottom layer metal grounding plate is provided with a slot line structure; the slot line structure is symmetric with respect to the axis, and comprises a circle resonant cavity, a rectangular slot line and a horn type slot line connected in series in order along the symmetric axis of the slot line structure; the input port feed line, the half-wavelength resonator and the terminal short circuit step impedance resonator are quadrature to the symmetric axis of the slot line structure; the input port feed line is arranged in the connecting portion between the rectangular slot line and the circle resonant cavity; the terminal open circuit half-wavelength resonator is arranged right above the circle resonant cavity; the terminal short circuit step impedance resonator is arranged in the connecting portion between the rectangular slot line and the horn type slot line. The Vivaldi antenna is simple in structure, low in loss, wide in bandwidth, high in radiation efficiency, high in rectangular coefficient trap wave feature, and very suitable for the modern wireless communication system.

Description

[0001] [technical field] [0002] The invention relates to a microwave passive device, in particular to a Vivaldi antenna. [0003] [Background technique] [0004] In recent years, with the competition in the wireless communication market, communication has developed towards high speed and broadband. Spectrum resources, as a country's limited resources, have reached the point of stretching. The demand for communication equipment is increasing day by day. The traditional filter antenna design method focuses on the antenna and filter components themselves. First, they are independently designed and optimized according to standard impedance units, and then directly connected together. Due to the mutual influence between components, this method may cause impedance loss after cascading. configuration, the overall performance deteriorates. To avoid this effect, an additional matching circuit is usually added between the antenna and the filter. However, this complicates the circuit...

AI Technical Summary

Problems solved by technology

This design method can generate three notch passbands and improve the rectangular coefficient at the notch, but the structure processing is complicated and the error is large

[0007] In 2014, Priyanka Natani, Latheef Ahmed Shaik and others published "Hexagonal SRR Coupled UWB Vivaldi Antenna for Frequency Notched Applications" at IEEE.InternationalConference on Emerging Technology Trends in Electronics, Communication and Networking (26-27Dec.2014), proposing a microstrip line The feeder part introduces two hexagonal open-loop resonators to realize a Vivaldi antenna with a notch. Although this solution can get a good square coefficient at the notch, the structure is complex and the processing error is large.

[0008] In 2014, Aravinda Reddy K, Natarajamani S and S.K.Behera published "Antipodal Vivaldi Antenna UWB Antenna with 5.5GHz Band-Notch Characteristics" at IEEE.International Conference on Computing, Electronics and Electrical Technologies (21-22March 2012), proposing that the radiation unit Two symmetrical Ω-shaped slots are etched on the top, and the length of the slots is used to control the frequency of the notch. This design produces a notch, but the square coefficient is poor and the frequency selectivity is not good.

[0009] It can be seen from the above that the implementation of the Vivaldi antenna with notch characteristics in the prior art is relatively complicated, and it is not easy to process and integrate, and the gain of the non-notch frequency passband is not high, and the frequency selectivity at the notch is not good, so it is not suitable for modern wireless communication system

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